For those interested in a light pedal, I have bought and tried the Look Keo Blade pedals.

They are smaller and lighter than the Delta pedals at 230 grams per pair. The spring isn't metal but a carbon fiber plate that seems to work quite well.

The one problem is that they are so light that they do not rotate into the proper position to easily click into them. The low friction of the bearings is almost to high to allow them to rotate reliably. Now perhaps the bearing seals will wear in and allow the pedals to be more reliably rotated so I'll see about that.

The cleats are smaller so if you intend to use pedals like this you should have solid carbon soles on your shoes to prevent getting a hot-foot on long rides.

These smaller cleats are a great deal more difficult to walk on polished surfaces on so be sure when you buy the pedals you also order the rubber walking cleat covers at the same time. My old Delta covers work half-assed but fall off easily so if the Keo covers don't arrive on time you CAN use the old Delta covers for a short while.

My overall perception of these is that I will change over all of my bikes to these pedals. They seem to hold the cleat in more reliably and they click out easier.